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CVE-2025-27821

Good to know:

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Date: January 26, 2026

Out-of-bounds Write vulnerability in Apache Hadoop HDFS native client. This issue affects Apache Hadoop: from 3.2.0 before 3.4.2. Users are recommended to upgrade to version 3.4.2, which fixes the issue.

Severity Score

Related Resources (8)

https://lists.apache.org/thread/kwjhyyx0wl2z9b0mw0styjk0hhdbyplh
https://github.com/apache/hadoop/commit/2b32e46f666c7645f5d1e026be3982b99319ccb8
https://issues.apache.org/jira/browse/HDFS-17754
https://nvd.nist.gov/vuln/detail/CVE-2025-27821
http://www.openwall.com/lists/oss-security/2026/01/23/7
https://github.com/apache/hadoop
https://github.com/apache/hadoop/pull/7481
https://www.mend.io/vulnerability-database/CVE-2025-27821

Severity Score

Weakness Type (CWE)

Out-of-bounds Write

CWE-787

Top Fix

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Upgrade Version

Upgrade to version org.apache.hadoop:hadoop-hdfs-native-client:3.4.2;https://github.com/apache/hadoop.git - rel/release-3.4.2

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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